#include<cstdio>
int n,l,r;
int main(){
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
	scanf("%d%d%d",&n,&l,&r);
	int lt=l/n,rt=r/n;
	if(lt<rt){
		printf("%d\n",n-1);
		return 0;
	}
	printf("%d\n",r%n);
	return 0;
}
